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Home >> Services >> Prosthetic >> Upper extrimity >> Myo Electric Hand

Myo Electric Hand
Myoelectrically Controlled Prosthesis for Wrist Disarticulation
Hybrid Prosthesis for Above-Elbow Amputation
Below-Elbow Prosthesis

The myoelectrical hand prosthesis is an alternative to conventional hook prostheses for patients with traumatic or congenital absence of forearm(s) and hand(s). These prostheses have a stronger pinch force, better grip, and are more flexible and easier to use than conventional hooks.

Myoelectrical control is used to operate electric motor-driven hands, wrist, and elbows. Surface electrodes embedded in the prosthesis socket make contact with the skin and detect and amplify muscle action potentials from voluntarily contracting muscle in the residual limb. The amplified electrical signal turns on an electric motor to provide a function (e.g., terminal device operation, wrist rotation, elbow flexion). The newest electronic control systems perform multiple functions, and allow for sequential operation of elbow motion, wrist rotation and hand motions.

Myoelectrical hand prostheses provide improved function and range of functional position as compared to “hook” prostheses. Myoelectrical hand prostheses can be used for patients with congenital limb deficiencies and for patients with amputations sustained as a result of trauma or surgery. The device is appropriate for both above-the-elbow and below-the-elbow amputees, and for both unilateral and bilateral amputees. Patients must possess a minimum microvolt threshold (i.e., minimum strength of microvolt signals emitting from the remaining musculature of the arm) and pass a control test to be considered a candidate.

Myoelectrical hand prostheses are indicated for persons at least one year of age or older. Children with congenital absence of the forearm(s) and hand(s) are usually fitted with a conventional passive prosthesis until approximately age 12 to 16 months, at which time they may be fitted with a myoelectrical prosthesis.

Myoelectrical hand prostheses generally come with a one-year warranty for parts and labor. The motor and drive mechanisms typically last 2 to 3 years and may need to be replaced after this period. When used on a child, the sockets may need to be replaced every 12-18 months due to growth. With heavy use the entire prosthesis might require replacement by the fifth year.


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